Harness MCP

Harness MCP Skill

AI-powered CD operations, Git repository and pull request management via Harness MCP Server.

Prerequisites

Environment Variables

export HARNESS_API_KEY="your-api-key"
export HARNESS_DEFAULT_ORG_ID="your-org-id"
export HARNESS_DEFAULT_PROJECT_ID="your-project-id"
export HARNESS_BASE_URL="https://app.harness.io"
export HARNESS_ACCOUNT_ID="your-account-id"

API Token Generation

1. Navigate to Account Settings > API Keys in Harness UI
2. Click + API Key
3. Set permissions (minimum: pipeline execution, connector management)
4. Store securely

MCP Server Configuration

Claude Code

{
  "mcpServers": {
    "harness": {
      "command": "npx",
      "args": ["-y", "@anthropic-ai/mcp-harness"],
      "env": {
        "HARNESS_API_KEY": "${HARNESS_API_KEY}",
        "HARNESS_DEFAULT_ORG_ID": "${HARNESS_DEFAULT_ORG_ID}",
        "HARNESS_DEFAULT_PROJECT_ID": "${HARNESS_DEFAULT_PROJECT_ID}",
        "HARNESS_BASE_URL": "${HARNESS_BASE_URL}"
      }
    }
  }
}

Docker

docker run -e HARNESS_API_KEY=$HARNESS_API_KEY \
           -e HARNESS_DEFAULT_ORG_ID=$HARNESS_DEFAULT_ORG_ID \
           -e HARNESS_DEFAULT_PROJECT_ID=$HARNESS_DEFAULT_PROJECT_ID \
           harness/mcp-server:latest

Available MCP Tools

Git & Pull Request Workflows

List Repositories

repos = harness_list_repositories(
    org_id="${HARNESS_ORG_ID}",
    project_id="${HARNESS_PROJECT_ID}"
)

Create Pull Request

pr = harness_create_pull_request(
    repo_id="my-application",
    title="PROJ-123: Feature title",
    source_branch="feature/PROJ-123",
    target_branch="main",
    description="## Summary\nImplements feature.\n## Jira\n[PROJ-123](https://company.atlassian.net/browse/PROJ-123)"
)

Get PR Activities (Comments, Reviews)

activities = harness_get_pull_request_activities(repo_id="my-app", pr_number=42)
for activity in activities:
    if activity.type == "comment":
        print(f"Comment by {activity.author} at {activity.file_path}:{activity.line_number}")
    elif activity.type == "review":
        print(f"Review by {activity.author}: {activity.state}")

Sync PR Comments to Jira

activities = harness_get_pull_request_activities(repo_id="my-app", pr_number=42)
review_summary = []
for activity in activities:
    if activity.type == "review":
        review_summary.append(f"- **{activity.author}**: {activity.state}")

jira_add_comment(issue_key="PROJ-123",
    body=f"## PR Review\n**PR:** [#{42}]({pr.url})\n**Status:** {pr.state}\n\n" + "\n".join(review_summary))

PR-to-Jira Status Mapping

pr_sync:
  enabled: true
  jira_key_patterns:
    - title: "^([A-Z]+-\\d+)"
    - branch: "feature/([A-Z]+-\\d+)"
  transitions:
    pr_created: { transition: "In Review", comment: "PR created: {pr_url}" }
    pr_approved: { transition: "Approved", comment: "PR approved by {approver}" }
    pr_merged: { transition: "Done", comment: "PR merged to {target_branch}" }
  fields:
    pr_url: "customfield_10200"
    pr_status: "customfield_10201"
    reviewers: "customfield_10202"

Jira Connector Setup

Create Connector

connector:
  name: jira-connector
  identifier: jira_connector
  type: Jira
  spec:
    jiraUrl: https://your-company.atlassian.net
    auth:
      type: UsernamePassword
      spec:
        username: your.email@company.com
        passwordRef: jira_api_token
    delegateSelectors:
      - delegate-name

Required Scopes: read:jira-user, read:jira-work, write:jira-work

Jira Create Step in Pipeline

- step:
    name: Create Jira Issue
    type: JiraCreate
    spec:
      connectorRef: jira_connector
      projectKey: PROJ
      issueType: Task
      fields:
        - name: Summary
          value: "Deployment: <+pipeline.name> - <+pipeline.sequenceId>"
        - name: Priority
          value: Medium

Jira Update Step

- step:
    name: Update Jira Issue
    type: JiraUpdate
    spec:
      connectorRef: jira_connector
      issueKey: <+pipeline.variables.jiraIssueKey>
      fields:
        - name: Status
          value: Done
      transitionTo:
        transitionName: Done
        status: Done

Jira Approval Step

- step:
    name: Jira Approval
    type: JiraApproval
    spec:
      connectorRef: jira_connector
      issueKey: <+pipeline.variables.jiraIssueKey>
      approvalCriteria:
        matchAnyCondition: true
        conditions:
          - key: Status
            operator: equals
            value: Approved

Integration with Jira Orchestrator

Configuration

harness:
  account:
    account_id: "${HARNESS_ACCOUNT_ID}"
    org_id: "${HARNESS_ORG_ID}"
    project_id: "${HARNESS_PROJECT_ID}"
  api:
    base_url: "https://app.harness.io"
    api_key: "${HARNESS_API_KEY}"
  mcp:
    enabled: true
    tools:
      - harness_get_connector
      - harness_list_pipelines
      - harness_get_execution
  jira_connector_ref: "jira_connector"
  sync:
    auto_create_issues: true
    auto_transition: true
    environments:
      dev: "In Development"
      staging: "In QA"
      prod: "Released"

MCP Tool Usage

connector = harness_get_connector(connector_id="jira_connector", org_id="default", project_id="my_project")
executions = harness_list_executions(pipeline_id="deploy_pipeline", limit=10)
execution = harness_get_execution(execution_id="abc123", org_id="default", project_id="my_project")

REST API for PR Operations

Base URL

HARNESS_CODE_API="${HARNESS_BASE_URL}/code/api/v1"

Authentication

curl -H "x-api-key: ${HARNESS_API_KEY}" \
     -H "Content-Type: application/json" \
     "${HARNESS_CODE_API}/repos/{repo-ref}/pullreq/{pr-number}/comments"

Key Endpoints

Create General Comment

curl -X POST "${HARNESS_CODE_API}/repos/${REPO}/pullreq/${PR}/comments" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{"text": "Great work!"}'

Create Code Comment

curl -X POST "${HARNESS_CODE_API}/repos/${REPO}/pullreq/${PR}/comments" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "text": "Consider adding null check",
    "path": "src/auth.ts",
    "line_start": 42,
    "line_end": 45,
    "line_start_new": true,
    "line_end_new": true
  }'

Submit Review

curl -X POST "${HARNESS_CODE_API}/repos/${REPO}/pullreq/${PR}/reviews" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{"commit_sha": "abc123", "decision": "approved"}'

Decision Values: approved, changereq, reviewed

Merge PR

curl -X POST "${HARNESS_CODE_API}/repos/${REPO}/pullreq/${PR}/merge" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "squash",
    "source_sha": "abc123",
    "title": "feat: Add auth",
    "delete_source_branch": true
  }'

Merge Methods: merge, squash, rebase, fast-forward

Bash Helper Functions

export HARNESS_CODE_API="${HARNESS_BASE_URL:-https://app.harness.io}/code/api/v1"

harness_pr_comment() {
  local repo="$1" pr="$2" text="$3"
  curl -s -X POST "${HARNESS_CODE_API}/repos/${repo}/pullreq/${pr}/comments" \
    -H "x-api-key: ${HARNESS_API_KEY}" \
    -H "Content-Type: application/json" \
    -d "{\"text\": \"${text}\"}"
}

harness_pr_approve() {
  local repo="$1" pr="$2" commit_sha="$3"
  curl -s -X POST "${HARNESS_CODE_API}/repos/${repo}/pullreq/${pr}/reviews" \
    -H "x-api-key: ${HARNESS_API_KEY}" \
    -H "Content-Type: application/json" \
    -d "{\"commit_sha\": \"${commit_sha}\", \"decision\": \"approved\"}"
}

harness_pr_merge() {
  local repo="$1" pr="$2" method="${3:-squash}" source_sha="$4" title="$5"
  curl -s -X POST "${HARNESS_CODE_API}/repos/${repo}/pullreq/${pr}/merge" \
    -H "x-api-key: ${HARNESS_API_KEY}" \
    -H "Content-Type: application/json" \
    -d "{\"method\": \"${method}\", \"source_sha\": \"${source_sha}\", \"title\": \"${title}\", \"delete_source_branch\": true}"
}

Python Client

import requests, os
from typing import Optional, Literal

class HarnessCodeAPI:
    def __init__(self, api_key: str = None, base_url: str = None):
        self.api_key = api_key or os.environ.get("HARNESS_API_KEY")
        self.base_url = base_url or os.environ.get("HARNESS_BASE_URL", "https://app.harness.io")
        self.api_url = f"{self.base_url}/code/api/v1"
        self.headers = {"x-api-key": self.api_key, "Content-Type": "application/json"}

    def create_comment(self, repo: str, pr_number: int, text: str, path: Optional[str] = None,
                      line_start: Optional[int] = None, line_end: Optional[int] = None,
                      parent_id: Optional[int] = None) -> dict:
        url = f"{self.api_url}/repos/{repo}/pullreq/{pr_number}/comments"
        data = {"text": text}
        if parent_id:
            data["parent_id"] = parent_id
        elif path and line_start:
            data.update({"path": path, "line_start": line_start, "line_end": line_end or line_start,
                        "line_start_new": True, "line_end_new": True})
        return requests.post(url, headers=self.headers, json=data).json()

    def submit_review(self, repo: str, pr_number: int, commit_sha: str,
                     decision: Literal["approved", "changereq", "reviewed"]) -> dict:
        url = f"{self.api_url}/repos/{repo}/pullreq/{pr_number}/reviews"
        data = {"commit_sha": commit_sha, "decision": decision}
        return requests.post(url, headers=self.headers, json=data).json()

    def approve(self, repo: str, pr_number: int, commit_sha: str) -> dict:
        return self.submit_review(repo, pr_number, commit_sha, "approved")

    def merge(self, repo: str, pr_number: int, source_sha: str,
             method: Literal["merge", "squash", "rebase", "fast-forward"] = "squash",
             title: Optional[str] = None, delete_source_branch: bool = True,
             dry_run: bool = False) -> dict:
        url = f"{self.api_url}/repos/{repo}/pullreq/{pr_number}/merge"
        data = {"method": method, "source_sha": source_sha, "delete_source_branch": delete_source_branch, "dry_run": dry_run}
        if title:
            data["title"] = title
        return requests.post(url, headers=self.headers, json=data).json()

Multi-Repository Workspace Support

Configuration

harness:
  workspace:
    repositories:
      - identifier: frontend-app
        path: ./frontend
        jira_project: FRONT
      - identifier: backend-api
        path: ./backend
        jira_project: BACK
    auto_create_repos: true
    default_branch: main
  review:
    cross_repo_review: true
  jira:
    sync_enabled: true
    aggregate_prs: true

Python API

from lib.harness_code_api import HarnessCodeAPI

client = HarnessCodeAPI()
repos = client.setup_workspace_repos([
    {"identifier": "frontend", "path": "./frontend"},
    {"identifier": "backend", "path": "./backend"}
])
prs = client.get_workspace_prs(repo_identifiers=["frontend", "backend"], state="open", jira_key="PROJ-123")

Repository Creation

Python

repo = client.create_repository(
    identifier="my-service",
    description="User management service",
    default_branch="main",
    is_public=False,
    readme=True,
    license="MIT"
)

REST API

Confluence Documentation Integration

Auto-Documentation

from lib.confluence_doc_linker import ConfluenceDocLinker

linker = ConfluenceDocLinker()
docs = linker.ensure_issue_docs("PROJ-123")
linker.link_readme_to_confluence(readme_path="./README.md", jira_key="PROJ-123")

Configuration

documentation:
  confluence:
    base_url: "${CONFLUENCE_BASE_URL}"
    space_key: "ENG"
  auto_create:
    enabled: true
    on_work_start: true
  readme:
    auto_update: true

Troubleshooting

Debug Logging

export HARNESS_LOG_LEVEL=debug
export MCP_DEBUG=true

Best Practices

1. Use Harness Secrets for credentials
2. Select delegates with direct Jira network access
3. Configure error handling with retries
4. Enable logging for all operations
5. Scope API tokens to minimum permissions

Related Resources

• Harness MCP Server
• Harness Code Repository
• PR Review
• PR Merge
• Jira Connector Setup
• Jira Steps in CD

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